janl/mustache.js — comment on commit 58c91c8c7d193b2c6e3dc3ebc4eb136a9bf1ea9f
File:  line 0
By geuis:

Why was this switched from arrays to string concatenation? String concatenation is expensive compared to array operations and a single .join() to covert to a string. Were any benchmarks done that show string concatenations here provide a performance improvement?